Oil-pump.



N. MUCARTY.

OIL PUMP.

APPLICATIQN FILED Nov.9,1909.

Patented Feb. 22, 1910.

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' 'or INDIaNaPoLIs, INDIANA, n conPonA'rroN er INDIANA.

(BIL-PUMP.k

Spectcation of Letters atent.

Patentes ses. 22, 191e.

Application lled `November 9, 1909. Serial No. 527,038.

To all whom 'it may concern:

Be it known that I, NORMAN MCCARTY, a citizen of the United States,residing at Indianapolis,` in the `county of Marion and s State otIndiana, have invented certainnew and useful Improvements in Oil-Pumps,of-

which the following is a specification.

The object of my invention is-to produce atwo stage pump of suchcharacter that variably measured qua-ntitiesof a liquid may be deliveredby the low pressure section to the high pressure section'and from thencedischarged 'against high pressure, the construction beingsuch that theplunger of t-he low pressure section shall be positively actuated inboth directions and the construction being also such that the variationin the action of the plunger of the low pressure section shall be 'underthe control yof a speed n controlled governor in such manner that theaction ot' the speed controlled governpr shall be'siilistantial'ly freeduring all possible positions or the low pressure plunger.

The accompanying drawing, which is al delivers into the high pressurechamber near its outlet. Arranged inv passage 13 between the highpressure and low ressure chambers is a check valve 14 whic opens towardthe high pressure chamber. Leading into the low pressure chamber 11 is asupply ipe 15 provided withan inwardly openinc eck valve 16, and leadingfrom the hig pressure chamber 112 is an outlet pipe 17 ro vided with anoutwardly opening cleck valve 18. Projected into chamber 11, through asuitable packing box ,19 isthe low pressure plunger 21, and projectedinto the ugh pressure chamber l2 through a suitable packing box 22 is ahi h pressure plunger 23. Plunger 23 is adapted to be reciprocated byany suitable means, such for instance as an arm 24 carried by theeccentric strap 25 mounted upon an eccentricv 26 carried by the shaft 27operated in any suitableemanner, as for instance by an internalcombustion engine with which the `pump is adapted to be connected forsupplying variably measured l quantities of liquid fuel to an atomizerstruc- D ture delivering into the combustion chamber of the en ine.ANone of these parts are shown in tie drawings for the reason that theyare all of ordinary construction and form no part of my presentinvention.

For the practical and successful operation of niy improvedpump it isnecessary that the plunger 21 be positively actuated in both directionsand that it be operated inf synchronism lwith the high pressure plunger,and for that reason 'I provide a mechanical connection between the twoplungers as fol- 'lowsaf Pivot'ed at 31 to plunger 23 is a rod 32 whichis pivoted at its upper end to one arm of a lever 33 pivoted at 34 upona bracket 35. The other arm oflever 33 is pivoted at 36 to one end of alever 37 the opposite endl of which is connected at 38 to the upper endof a link 39 connected at its lower'e'nd'to plunger 21, the arrangementbeing such that the movement'of the two plungers relative to theirrespective f chamberswill be opposite.

y In order to vary the stroke of plunger21, lever 37 is provided betweenits ends with a.- .slot 4l adapted to receive 'a pin 42 which pin isalso projected into a slot 43 formed in bracket 35, the angle of saidslot correspond,- ing to the angle of slot 41 when the parte are in theposition shown in the drawings where plunger- 23 has been `pro'ected toits full extent into chamber 12 an plunger 21 has been withdrawn fromchamber 11l to its full extent. Pin 42 is carried by a .link

44 connected in any suitable manner, as by means of lever 45, withajspeed cont-rolledj 90 governor 46 which 1s merelyindicateddiagrammatically, the varrangement being such that, when the parts arein thev positions shown in the drawing, pin 42 may be shifted in slots41 and 43 so as to vary the ratio of the two arms oflever 37 without*however cans-v f i fing any movement of said lever. twjill' be seen fromthis arrangement `that theoutpr position of plunger 21 will be thesamemall positions of adjustment of pin 42, the

variation of stroke ofthe plmiger 2.1 `re sulting in agreater. orlessinward projection ofthel plunger from the position shown.

in t-he drawings. i y p y y v With the parts in the positionshown 1n thedrawin an outward or downward movenient of p-unger 23 wi swmg on pin 42but also cause the said lever toinove to the right on said pin and, withthe parts proportioned -as shown in the 110 cause lever 37 toy drawings,the resultant movement 'of the pivot 38 will be along the arc of acircle whose center is the point of attachment of link 39 with plunger21 so that there will be no movement of the plunger 21 and zconsequentlyno propulsion of liquid from the low pressure chamber 11 past valve 14.into the high pressure chamber 12. By moving pin i2 to the left in slots43 and 41, the edect of the movement of lever 7 upon plunger 21 may begradually increased until the maximum stroke of said plunger is obtainedwhen pin 42 lies at the left hand end of slot 43.

It will be noticed that there is no time when there is any materialpressure exerted on' pin i2 as the spring which holds valve 14 to itsseat is very'lighi; and the iiovv from chamber '11 to chamber 12 takesplace at a very small pressure.

l claim as my invention 1. ln a pump having a. high pressure chamber, aloW pressure chamber, a connection between said chambers, and means forpreventing back ilow from the high pressure to the low pressure chamber,a check valve in the inlet of the low pressure chamber, a check valve inthe outlet of the high pressure chamber, a high pressure plungerprojectable into the high pressure chamber, a low pressure plungerprojectable into the lonv pressure chamber, intermediate positiveconnections between the two plungers for producing positive actuation orsaid plungers 1n opposite directions relative to their res ectivechambers, whereby discharge from tiie low ressure chamber into the highpressure c amber will take place before discharge from the high pressurechamber, and means for varying the eiect of said intermediate positiveconnections upon the low pressure plunger whereby the strolre thereof lwill be varied.,

sure chamber, a high pressure plunger projeetable into the high pressurechamber, a low pressure plun er projectable into the low pressure chamer, an operating lever for the low pressure plunger, a ulcrum for saidlever, means by which said fulcrummay be shifted relative to the leverto vary the arm ratio thereof, and intermediate ositive y connectionsbetween said lever .and t. e high pressure plunger, for the purpose setforth. 3; in a pump having a high pressure chamber, a ovv pressurechamber, a connee tion between said chambers, and means for preventingback flow from the high pressure to the low pressure chamber, a checkvalve in the -inletof the low pressure chamber, a check valve in theoutlet ofl tlie lever to vary the arm ratio thereof, a

guide for said iulcrum, said guide register- .ing in position with thelever whcnthe low pressure plunger is atfthe outer end of its strokewhereby, in all positions of adjustmont of the fulcrum the outermostposition of the low pressure plunger will be the same, means by whichthe fulcrum may be shifted, and intermediate positive connectionsbetween said lever and the high pressure plunger.

4. In a pump comprising a high pressure ejection chamber, a low pressuremeasuring chamber, and a connection between said chambers, a highpressure plunger mounted in the high pressure chamber, a low pres sureplunger mounted in the lowl pressure chamber, means for disestablishingconnecf tion between the two chambers during ejec tion movement of thehigh pressure plunger, means for automatically varyin the amount of theejecting movementof t e low pressure plunger, and means for moving thelow. pressure plunger to a uniform outer position. f

5. In a pump comprising a high pressure ejecting chamber, a low pressuremeasuring chamber, and an intermediate connection between said chambers,a. valve arranged be tween said chambers toprevent How from the highpressure chamber to the measuring chamber, a plunger arranged in thehigh pressure chamber, a plunger arranged in thev measuring chamber, alever engaging the low pressure plunger, intermediate .connectionsbetween said lever and the high pressure plunger, a fulcrum for saidlever, means vfor shifting said fulcrum relative to the lever to varythe effect thereof upon the low pressure plunger, and a supportfor saidful- Ulti Crum, whereby' the low pressure plunger will be'always movedto a unitormouter position. ln witness whereof, l have hereunto set myhand and seal at Indlanapohs, Indiana.,

this fourth day of November, A., D. one

thousand: nine hundred and nine.

`lNJRlWAl MCCARTY. [n 5.,]

. Witnesses v autunnali@e Hoon, THoMAs McManus.,

